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Lab Ex. 62 Fertilization & Early Development. zygote. morula. blastocyst. trophoblast. inner cell mass. embryo / gastrula. fetus. placenta. maternal portion. fetal portion. Chorion (maroon). chorionic villi. Amnion (white). amniotic cavity. yolk sac.
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ductus arteriosus Becomes ligamentum arteriosum
ductus venosus Becomes the ligamentum venosum
foramen ovale Becomes fossa ovalis